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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b14d825a40aa14707148d30c739faacfe10540120702c174c916c9b0d0e0e2d' 
  AND token = 'ktPBe1hG2ZQj7Vrom5AbfSJ42MZzONKa1No/N9Nor1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}